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Dissertations / Theses on the topic 'Chemical removal'

Author: Grafiati

Published: 15 June 2024

Last updated: 31 July 2025

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1

Bernstein, Howard. "A system for heparin removal." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/15291.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1985.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE.<br>Bibliography: leaves 255-264.<br>by Howard Bernstein.<br>Ph.D.

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2

Gaulin, Jean-Philippe. "Selective caffeine removal by microbial consortia." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80272.

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Coffee processing presents a considerable waste disposal problem, mainly because of the large volumes generated and the chemical composition of the by-products, particularly the caffeine levels. The use of Pseudomonas putida IF-3, a caffeine-degrading microorganism, in a microbial consortium for bioremediation of caffeine found in coffee wastes was investigated. Caffeine degradation was observed in fed-batch reactor experiments with caffeine as sole source of carbon and nitrogen. Metabolic regulation and caffeine removal potential by Pseudomonas putida IF-3 were investigated by suppleme

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3

Roostaei, Nadia. "Removal of phenol from water by adsorption." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0001/MQ46605.pdf.

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4

Abdulrahman, Aymn. "Removal of mixed acids from aqueous solution." Thesis, The University of Maine, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3662514.

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<p> Carboxylic acids are commonly generated in biorefinery operations such as fermentation or aqueous extraction of hemicellulose feedstocks. In most cases, organic acids are generated as dilute components in aqueous streams. If they can be recovered from solution inexpensively they may find value as pure chemical products or as starting materials for a wide variety of organic products, including biofuels.</p><p> Liquid-liquid extraction is a separation method applied to recover mixed carboxylic acids from a fermented wood extract. These acids included: acetic, propionic, butyric, valeric, c

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5

Ng, Dedy. "Nanoparticles removal in post-CMP (Chemical-Mechanical Polishing) cleaning." Thesis, Texas A&M University, 2005. http://hdl.handle.net/1969.1/4159.

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Research was performed to study the particle adhesion on the wafer surface after the chemical-mechanical polishing (CMP) process. The embedded particles can be abrasive particles from the slurry, debris from pad material, and particles of film being polished. Different methods of particle removal mechanism were investigated in order to find out the most effective technique. In post-CMP cleaning, surfactant was added in the solution. Results were compared with cleaning without surfactant and showed that cleaning was more effective with the combined interaction of the mechanical effort from the

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6

Mahmud, Hassan. "Development of pervaporation membrane for volatile organic chemical removal." Thesis, University of Ottawa (Canada), 1996. http://hdl.handle.net/10393/9896.

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Pervaporation is a membrane based process which overcomes many of the deficiencies of current technologies for the removal/recovery of volatile organic chemicals (VOCs) from aqueous streams. In this process, VOCs from a liquid stream are driven across a permselective membrane and exit as a vapor due to the vacuum maintained in the downstream side of the membrane. Proven hydrophobic membranes used for pervaporation today suffer from limitations of mechanical stability, while membranes with superior mechanical characteristics do not possess sufficient selectivity to be useful for these applicati

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7

Omoregie, Henryson Osawaru 1953. "Removal of chemical species by electrically charged bicomponent fibers." Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/282121.

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A new water deionization method was conceived and investigated. Bench scale reactors were designed and tested. Numerical analysis of ion movement in water in the presence of electrical, hydraulic, and chemical gradients was conducted. The new water treatment technology uses bicomponent fibers (BCF). Ions in water are concentrated near charged bicomponent fibers. Bicomponent fibers are composed of two materials. The outer annulus is made of nylon and has an inside diameter of 10 mum and outer diameter of 50 mum. The inner annulus is composed of carbon powder and has an outer diameter of 10 mum.

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8

Sundaram, Hari Prashanth. "SO₂ removal with coal scrubbing." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=2035.

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Thesis (M.S.)--West Virginia University, 2001.<br>Title from document title page. Document formatted into pages; contains vii, 42 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 33-34).

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9

Shieh, Marvin Bryan. "Face-up chemical mechanical polishing : kinematics and material removal rate." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36701.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2006.<br>Includes bibliographical references (leaf 27).<br>A working prototype face-up CMP tool has successfully been completed. Experiments conducted on the face-up CMP machine qualitatively correspond with the theoretical polishing model. Discrepancies in data from the theoretical model could potentially be caused by non-uniform loading of the polishing pad and uneven distribution of slurry over the pad due to the edge effects on fluid flow. Despite the discrepancies, experimental data suggest that the the

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10

Chua, Xiang Le. "Derivatisation of chemical warfare agent degradant without removal of water." Thesis, Chua, Xiang Le (2018) Derivatisation of chemical warfare agent degradant without removal of water. Masters by Coursework thesis, Murdoch University, 2018. https://researchrepository.murdoch.edu.au/id/eprint/42915/.

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Degradation products are distinct chemical signature for the detection of chemical warfare agents and forensic attribution in cases where the parent compound no longer exists. Being the common degradant to nerve agents, methylphosphonic acid serves as an explicit biomarker for the use of nerve agents. However, this non-volatile compound requires derivatisation prior to its detection, which incurs time-limiting factor and error. Therefore, development for a novel rapid and simple approach for identifying these degradants is of high importance to shed light on the use of chemical warfare agents

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11

Rois, Anwar Nurul Zaizuliana. "Removal of crystalline confectionery material from hard surfaces." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6542/.

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Cleaning of surfaces in contact with chocolate is necessary in chocolate manufacturing to ensure high production quality. This research was carried out to study the removal behaviour of solid dark chocolate from three surface materials; stainless steel 316, polycarbonate and polytetrafluoroethylene (PTFE). In order to understand the crystallization behaviour and its relationship with the chocolate rheology, a differential scanning calorimeter (DSC) was used to characterize the polymorphs, while a rheometer was used to study the rheological behaviour of chocolate. The polymorphism was found to

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12

McHarg, Amy Marie. "Optimisation of municipal wastewater biological nutrient removal using computer simulation." Thesis, University of Ottawa (Canada), 2002. http://hdl.handle.net/10393/10479.

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Due to more stringent regulations for secondary municipal wastewater treatment, municipalities are beginning to implement tertiary treatment in their wastewater treatment plants. Tertiary treatment would be the removal of either phosphorous or nitrogen or both from the wastewater before it is discarded from the plant. Biological treatment is becoming an increasingly popular process used to accomplish this extra removal. There are several processes available that will provide acceptable levels of biological nutrient and BOD removal from wastewater. Three well-known processes were considere

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13

Mahmud, Hassan. "Removal of organics from water/wastewater by membrane air-stripping." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ66171.pdf.

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14

Dumortier, Rémy. "Selective removal of gallium from aqueous solutions using organophosphorus ligands." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=85157.

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The removal and recovery of gallium (III) from aqueous solutions was investigated using different ligands. Sodium di-(n-octyl) phosphinate was found to be the most effective ligand. The metal-ligand complexes formed had the advantages of being highly insoluble in water and allowing a good regeneration of the ligand at the end of the cycle. The effect of time, pH, mole ratio of ligand to metal, temperature and the presence of other ions, such as Na+, NO3-, Cl- and SO42-, was also studied. At the end of the removal process, gallium was recovered from the insoluble complexes using a solven

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15

Wibulswas, Ratanawan. "Removal of organic compounds for water using modified Montmorillonite." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368193.

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16

Mortazavi, Saviz. "Removal of arsenic from water using adsorption on alumina/membrane separation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1995. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq22006.pdf.

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17

Prasetyo, Imam. "Removal of toxic metals from aqueous solutions by biosorption." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60713.

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Several non-living algal and fungal biomass types were investigated for biosorption of cadmium, lead and a number of other heavy metal ions in aqueous solution. Marine algae A. nodosum was identified for the highest uptake for these metals, and even better than commercial ion exchange resin. A. nodosum maximum uptake capacities for lead and cadmium were in excess of 2590 mg Pb/(g dried biomass) and 120 mg Cd/(g dried biomass), respectively (pH:3.5-5.5). The adsorption mechanism for this natural material is reversible. Meal ions can be easily eluted from the biosorbent with dilute mineral acids

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18

Chen, Huan 1971 Mar 8. "Electrokinetic removal of zinc and lead from saturated clay." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=20198.

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Electrokinetic remediation is an in-situ technique in which a direct current is applied across a water-saturated contaminated soil. As a result, metal ions are transported through the soil from the anode toward the cathode by electromigration, electroosmosis and diffusion. Electrokinetic remediation experiments were performed with Bentonite clay contaminated with Pb and/or Zn under a constant current. The clay bed was cylindrical with a diameter of 5 cm and a length of 15 cm.<br>The electroosmotic flowrate decreased with time due to a significant increase in the concentration of H+ ions in the

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19

He, Jiahan. "Removal and degradation of chlorinated organic compounds in groundwater." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/280357.

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The first part of this work demonstrates that membrane air-stripping (MAS) is an efficient method for separating volatile organic compounds from water. The introduction of a membrane barrier to separate the air and water phases provides several advantages without increasing the total mass transfer resistance. Efficient removal can be achieved at lower air/water ratios than are typically required in packed-tower. Mathematical models were developed to simulate the performances of both countercurrent-flow and cross-flow contractors. Model simulations indicate that the cross-flow contractor is mor

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20

Nadeem, Syed Ahmad. "Aspects of SOâ†2 removal in a fluidized bed combustor." Thesis, University of Leeds, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.291078.

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21

Leggett, Graham. "Chemical strategies for removal of trace impurities from gases and solvents." Thesis, Queen Mary, University of London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.731713.

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22

Conley, LuAnne Simpson. "Removal of complexed iron by chemical oxidation and/or alum coagulation." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-03172010-020643/.

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23

Khawaja, Anmol. "High temperature removal of H2S by using MNO." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-233862.

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Förgasning av biomassa är en åtråvärd process då det erbjuder en mängd olika slutprodukter såsom; värme, kraft, biometan, väte etc. Dessa fås från de bildade produkterna från förgasningen, dvs. H2, CO, CO2, CH4 och H2O(g). Det är emellertid även känt att processen producerar orenheter under förgasningssteget såsom NH3, H2S, HCl, tjära och partiklar. En lösning för att avlägsna tjära är genom katalytisk tjärsprickning som sker under höga temperaturer direkt efter förgasaren. Huvudproblemet med detta är att den katalysator som används är känslig gentemot H2S ty gasen deaktiverar katalysatorn. På

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24

Mbedzi, Ndishavhelafhi. "An investigation into the removal of aluminosilicates scaling species by activated alumina." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/5443.

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Includes abstract.<br>Includes bibliographical references (leaves 69-74).<br>Gas condensates from the coal conversion plants contains trace amounts of inorganic species such as Si, Ca and Al ions, which cause scaling in downstream processes. Silica has been identified as the main constituent of the scale materials in geothermal plants. In order to prevent scaling, silica ions need to be removed or reduced. Alumina has been shown to successfully remove both silica and calcium from waste water streams. However, it also causes an increase in the aluminum concentration through dissolution. The mec

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25

Yan, Qingmei. "Biological nitrogen removal of saline wastewater by ammonium oxidizers." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B42182116.

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26

Whyte, Ian. "Reticulated vitreous carbon cathodes for metal ion removal from process streams." Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316472.

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27

Andersson, Mathilda. "Biochar removal of micropollutants in wastewater effluentsfrom Morocco and South Africa." Thesis, Umeå universitet, Kemiska institutionen, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-136632.

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28

Charlson, Alexandra. "Removal of pharmaceuticalcontainingwastewater by bioandhydrochar adsorbents : Adsorption capacity and surface functionalities." Thesis, Umeå universitet, Kemiska institutionen, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-136762.

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29

Saad, Ramzi Fayez. "Selected heavy metal and organic removal from wastewater by precipitation and ozonation processes." Thesis, University of Ottawa (Canada), 1998. http://hdl.handle.net/10393/4545.

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Experiments were conducted to precipitate dissolved copper, zinc, and lead from simulated wastewater solutions as solids which could then be separated by filtration. The precipitants used were hydrated lime, as a slurry and in powdered form, aqueous ammonium hydroxide, ferrous sulphide sludge, and carbon dioxide gas. These five different chemicals, singly or in combination, were used; at least one of which was highly successful in precipitating each of the metals, removing at least 99% of that originally present. Copper and zinc were very effectively precipitated as the hydroxides with lime, w

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30

Yu, Bo. "Sulfate removal from concentrated sodium chloride brines for chloralkali industry with nanofiltration membranes." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27202.

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Nanofiltration membrane elements have been employed for the treatment of solutions containing raw brine generated by chloralkali industry. This study focused on the selection of appropriate nanofiltration membrane element and the assessment of their performance for the removal of sulfate and the retention of chloride from feed solutions. The influence of membrane type, temperature, pressure and sodium sulfate concentration on the selective removal of sulfate from concentrated sodium chloride brines were investigated. A high passage of sodium chloride and rejection of sodium sulfate were achiev

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31

Husein, Maen. "Removal of lead from aqueous solutions with compounds having the sodium carboxylate group." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27228.

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Lead was removed from aqueous solutions using reagents having the sodium carboxylate group. For sodium acrylate and sodium polyacrylate, the removal of lead increased, and the reagent loss decreased when using sodium polyacrylate compared to the monomer, and when using a polymer with higher molecular weight. Sodium propionate did not precipitate lead. Sodium oleate formed a suspension with lead. Sodium caprate formed an easily filterable precipitate. For a feed concentration of 1450 ppm lead, and a mole ratio of caprate to lead of 2, the percentage removal of lead and the percentage loss of ca

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32

JI, LEI. "Novel Nano-Structured Sorbents for Elemental and Oxidized Mercury Removal from Flue Gas." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1212028586.

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33

Nazarian, Reyhaneh. "Advanced Phosphate Removal in Dialysis Employing Lanthanum Impregnated Activated Carbon Fixed-Bed Column." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1515508343971243.

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34

Juneja, Harpreet. "Removal of Adsorbed Moisture and Organics from Surfaces and Nanostructures in Semiconductor Manufacturing." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/193597.

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As the semiconductor industry is moving towards achieving smaller, denser and faster integrated circuits; the issue of contamination control is becoming increasingly important. The current work focuses on the mechanism and kinetics of removal of adsorbed moisture and organics from surfaces and nanostructures.In the first application of this study, a novel approach to the characterization of dynamic interactions of gases with solid surfaces is developed. A model is developed to represent the simultaneous adsorption and desorption processes in these systems. The model can simulate both the non-e

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35

Paragano, Matthew Vincent. "Liquid Systems for Carbon Dioxide Removal in Spacecraft Environments." Thesis, Yale University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10783463.

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<p> As humans strive to explore deeper into the solar system, the need for efficient, compact, and reliable life support systems for providing breathable air and drinkable water become critical to mission success. One element of providing breathable air is the removal of metabolic gaseous waste products, primarily consisting of carbon dioxide, from the cabin air. Recent work on human performance has suggested that carbon dioxide has effects on human performance at lower concentrations than previously anticipated and at concentrations lower than presently controlled to on the International Spac

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36

Bonner, Alison Lee 1966. "Oxidation and removal of organic impurities from ultrapure water." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/277910.

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This study focuses on three aspects of the removal of organic impurities from ultrapure water. The interactions between system components such as ion exchange, UV unit and filter on overall purification are examined. The results indicate that the sequencing of the UV unit and the filter affects the TOC removal efficiency so that greater TOC removal is achieved when filtration precedes UV treatment. Furthermore, a UV unit followed by an ion exchange tank is an effective configuration for the removal of some impurities, but is undesirable for others particularly the charged macromolecules and pa

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37

Buchanan, Ian 1953. "Kinetic modelling of horseradish peroxidase catalyzed phenol removal for reactor development." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40325.

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Horseradish peroxidase (HRP) catalyzes the polymerization of aromatic compounds. These polymers precipitate from solution and may be removed by filtration or sedimentation. The useful lifetime of the enzyme is limited by inactivation which occurs during the removal process; however, the rate of enzyme inactivation is significantly lower in the presence of high molecular mass polyethylene glycol (PEG).<br>An empirical model has been developed to relate phenol concentration after complete batch reaction to the initial concentrations of phenol and HRP, both in the presence and the absence of PEG.

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38

Salvesen, Thomas Alexander. "Sol-gel derived palladium catalysts for the removal of automotive chemical pollutants." Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/843351/.

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Sol-gel production of catalyst supports has been investigated in order to produce homogeneous, high surface area alumina/zirconia materials. A novel microwave method of preparing colloidal Pd has been developed and a range of alumina/zirconia supported Pd catalysts has been produced. These have been tested for activity in terms of temperature programmed three way catalysis (simultaneous removal of NO, CO and C3H8 from a simulated car exhaust stream) and from the array of catalysts produced a suitable catalyst was chosen for further investigation. This catalyst had a 3% zirconia / 97% alumina s

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39

Collins, William D. "Chemical treatment of corroding steel reinforcement after removal of chloride contaminated concrete." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-08182009-040410/.

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40

Clark, T. "The impact of chemical addition for phosphorus removal on activated sludge treatment." Thesis, Cranfield University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268135.

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41

Rosendahl, Sara. "Modelling control strategies for chemical phosphorus removal at Tivoli wastewater treatment plant." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-453546.

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Wastewater compose an environmental risk as it contains high levels of nutrients, including phosphorus. Wastewater treatment plants (WWTPs) reduce phosphorus by using coagulants that precipitate soluble phosphate into metal phosphate, which is separated by settling. Coagulant flow is regulated by a control strategy, typically feedforward or feedback control. Feedforward is based on incoming wastewater disturbances whereas feedback control uses outgoing process values. Incoming phosphate is hard to measure and can be estimated using soft sensors. Modelling control strategies can help decide whi

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Karra, Pavan K. "Modeling and control of material removal and defectivity in chemical mechanical planarization." [Ames, Iowa : Iowa State University], 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3355516.

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Lingaraju, Bala P. "Removal of Nitrogen from Wastewater Using Microalgae." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1321888338.

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Yang, Yang. "Removal Mechanisms of Protective Iron Carbonate Layer in Flowing Solutions." Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1339731278.

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LIU, Fangzhu. "Integration of Chemical Oxidation and Biotreatment for Removal of TNT from Explosives Contaminated Soil." MSSTATE, 2002. http://sun.library.msstate.edu/ETD-db/theses/available/etd-12032002-152100/.

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2,4,6-trinitrotoluene (TNT) is of environmental concern because it?s a possible human carcinogen and it also remains potentially explosive. The Department of the Army (DA) estimates that there are 540,000 cubic meters (700,000 cubic yards) of explosives-contaminated soil at over 2,000 sites that require remediation. Biological treatment of TNT results in the production of the reduced intermediates (such as aminonitrotoluenes). When using chemical oxidation processes to treat TNT, 1,3,5-trinitrobenzene (TNB) is produced. The by-products of both biological and oxidation treatment processes are r

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46

Dube, Vuyiswa. "Study of selective removal of CoS and NiS during purification of MnSO₄ electrolyte." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/13710.

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This research project investigated the selective removal of Co²⁺ and Ni²⁺ from a Co-Ni-Mn system through sulphide precipitation. The Co²⁺ and Ni²⁺ ions have adverse effects on the purity of the manganese product, thus, have to be removed via precipitation in a purification step. The main objective of this research was to understand the influence of local supersaturation on the purification process. This was important for controlling such a process to achieve residual ion concentrations of 0.3 ppm and 1.0 ppm for Co²⁺ and Ni²⁺ ions respectively, with minimum

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47

Palabiyik, Ibrahim. "Investigation of fluid mechanical removal in the cleaning process." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4593/.

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The cleaning of pipework from fluids of high viscosity is a significant problem in many food and personal care industries which can cause considerable economic and environmental impact. Three stages are identified in the cleaning of straight pipes; (i) a short core removal stage of product recovery, before water breaks through the filled pipe, (ii) the 1st cleaning stage (film removal stage) when there is a continuous wavy annular film on the wall, and (iii) the 2nd cleaning stage (patch removal stage) in which the material is present as patches on the wall. The product recovery stage is found

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48

Wang, Bei. "Microalgal Lipids Production and NitrogenPhosphorus Removal Using the Green Alga Neochloris oleoabundans." Thesis, University of Ottawa (Canada), 2010. http://hdl.handle.net/10393/28571.

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A Neochloris oleoabundans strain screened in our lab was demonstrated to have the ability to accumulate large quantities of triglycerides, the feedstock of biodiesel production, and to remove nitrogen and phosphorus from wastewater efficiently. Box-Behnken experimental design (BBD) and response surface method (RSM) were used to study the effects of a large number of nutrients on cell growth and lipid accumulation. The optimized medium supported a lipid concentration of 641.4 mg/l and a cell density of 2.54 g/l, which were 4.5-fold and 2.2-fold of that obtained with the basic medium, modified B

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49

Esalah, Jamaleddin. "Removal of heavy metals from aqueous solutions by precipitation with sodium di-(n-octyl) phosphinate." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=37715.

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Two organophosphorus compounds: sodium di-(n-octyl) phosphinate and sodium di-(n-dodecyl) phosphinate, were synthesized and purified. Sodium di-(n-octyl) phosphinate was used both as a surfactant to form reverse micelles and as a precipitating agent to remove heavy metals from aqueous nitrate and chloride solutions.<br>The heavy metals lead, cadmium, and zinc were precipitated from aqueous solutions with sodium di-(n-octyl) phosphinate (NaL) in the form of PbL 2(s), CdL2(s), and ZnL2(s). The mole ratio of NaL to lead in the feed was varied from 0.1 to 6.5, depending on the acidity of the feed.

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Huang, Liangliang. "Computational Study of Toxic Gas Removal by Reactive Adsorption." Thesis, North Carolina State University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3538542.

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Abstract:

<p> Growing concerns about the environment and terrorist attacks prompt a search for effective adsorbents for removal of small molecule toxic gases, such as ammonia and hydrogen sulfide, under ambient conditions in the presence of moisture, where physical adsorption is not adequate. We use graphene oxide and CuBTC metal-organic framework as the adsorbents to explore toxic gas removal by reactive adsorption. Using <i>ab initio</i> density functional theory, atomistic reactive molecular dynamics and Monte Carlo simulation strategies, theoretical understanding of the underlying reaction and adsor

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